ZC836ATA

Overview

The ZC836ATA is a silicon hyperabrupt varactor diode from the 830 series, designed for frequency control and filtering applications. It features closely controlled capacitance-voltage characteristics and high Q factors. The nominal capacitance is 100 pF at 2V reverse bias (1MHz), with a minimum Q of 100 at 3V (50MHz). The device exhibits a capacitance ratio (C2/C20) between 5.0 and 6.5. Electrical specifications include a maximum reverse leakage current of 20 nA at 20V and a breakdown voltage of 5V at 1µA. It operates within a temperature range of -55°C to +150°C.

Feature Summary

• Hyperabrupt junction design providing high tuning ratios for efficient frequency modulation
• Low reverse leakage current ensuring minimal phase noise in oscillator circuits
• High quality factor (Q) maintaining signal integrity across operating frequencies
• Available in miniature surface mount packages including SOT23, SOD323, and SOD523

Applications

• Voltage Controlled Crystal Oscillators (VCXO)
• Temperature Compensated Crystal Oscillators (TCXO)
• Wireless communications systems
• Mobile radio equipment

Procurement Notes

Verify the specific package variant required, as the 830 series spans multiple footprint types. Confirm that the 'TA' suffix corresponds to 7-inch reels; substitute 'TC' for 13-inch reel requirements. Ensure compliance with RoHS directives and check for ESD handling precautions during storage and assembly. Validate component authenticity through authorized distribution channels.

Selection Notes

Select the ZC836ATA when a nominal capacitance near 100pF is required at low reverse bias voltages. The hyperabrupt characteristic makes it suitable for wide-band tuning applications compared to abrupt or linear graded junctions. Consider thermal dissipation limits if operating near maximum ambient temperatures, as power ratings vary by package type.

Part Context

This component belongs to the Zetex 830 series of silicon hyperabrupt varactor diodes. The series includes variants such as ZC829 through ZC835, offering different nominal capacitance values ranging from approximately 8pF to 68pF. The ZC836 represents the higher capacitance end of this specific product line.

Replacement Considerations

Direct substitutes within the same family include ZC836BTA, which shares identical electrical parameters but may differ in tolerance grading. Other series members like ZC835 or ZC834 offer lower capacitance values and should only be considered if circuit tuning ranges allow for adjustment.